Celery Seeds,
Amsterdam

Amsterdam celery should be started indoors 8-12 weeks before the last frost date in your area. For most regions, this means starting seeds in late winter to early spring. Once the temperatures are consistently above 50-55 F, you can transplant the seedlings outdoors. In milder climates, you can also start seeds in the fall​. In most climates it’s also possible to start celery in midsummer to harvest in fall. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

Celery seeds are tiny and should be sown on the surface of a quality seed starting mix, then lightly covered. Surface sow, gently pressing into the soil. Keep the soil consistently moist and maintain a temperature of 70-75 F until germination. After the seedlings have two sets of true leaves, they can be transplanted into larger pots or directly into the garden​.

Amsterdam celery requires rich, well-drained soil with plenty of organic matter. Incorporate compost or well-rotted manure into the soil before planting. Consistent watering is important as well. The soil should be kept evenly moist but not waterlogged. Mulch around the plants to retain moisture and regulate soil temperature​. You can apply a balanced, organic fertilizer every 4-6 weeks during the growing season​.

• Celery and celeriac are insect pollinated and should be isolated by 1 mile from each other to ensure seed purity.
• Both plants are biennial and must either be dug and stored or be left in the ground to overwinter and flower the following spring.
• Harvest the seeds when the flowers have completely dried on the plant.
• When stored properly, celery and celeriac seeds will last for 5 years or more.